Foam insulation- add more later?
Troubleshooter
| Posted in Energy, Heating & Insulation on
Can I have 4″ of hd foam sprayed on the bottom of the roof decking? Then come back years later and add more?
Also if I put the intumescent coating or just latex paint, can foam be added on top of that?
Replies
Can I Add New Insulation Over Old Insulation?
Yes! You can absolutely new insulation over old insulation… as long as it isn’t wet.
If it… appears that the insulation [is wet or] has previously been wet, you should look for the cause and repair the problem to prevent a reoccurrence. Remove any wet insulation. Wet insulation can lead to mold, mildew, or even the rotting of your ceiling or roof rafters.”
In fact, you can add new insulation over the existing installation in other areas of your home, not just the attic. And you don’t even have to choose the same material used in your existing insulation.
Rather, you should decide on the material that best meets your current needs, considering all of the following:
Energy efficiency
R-values (effectiveness of the insulation)
Your budget
Any health concerns you might have
Durability of the insulation material
Eco-friendliness of the material
Things to Keep in Mind When Installing New Insulation Over Existing Insulation
You have a few choices about the type of insulation you might install atop your old insulation:
Batt insulation
Rolled insulation
If you spray foam on top of foam can the old foam be painted?